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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For ePubs, any editing program (e.g. Calibre, Sigil, etc) will have an ePub check feature. You can also use the W3C's standalone ePub check tool: https://www.w3.org/publishing/epubcheck/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.